It depends on if you argue for or against it. For a thesis to being with community service maybe try something like:
Community service is something that can be very effective on our environment. The possibilities of a clean world can be achieved if more people were to band together and tackle issues such as littering and pollution. However, it seems that right now, many people are not so much for the cause or the effort in saving our planet.
Answer:
Primary sources can include the exact words that witnesses used to testify at a trial
Answer:
I don't know Go ask someone else not me..
Answer:
Whenever your thesis statement is visible at the end of the (introductory) paragraph
Explanation:
Usually your thesis statement is a combination of the introductory paragraph, or basically just re-iterating what your topic will be about. Some schools don't teach thesis statements the same way as others do. If that is the case, make sure your ending is clear and worded precisely. You are transittioning to the next paragraph, so also make sure your sentences flow into the next paragraph. Hope this helped! :)